Test Driving NHibernate 3.0, LINQ and the Entity Framework CTP 5 with the Abstract Factory Design Pattern

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using NHibernate;
using NHibernate.Cfg;
using NHibernate.Criterion;
using ORMDataServices.DataFactories.NHibernate;

namespace ORMDataServices.DataFactories.NHibernate
{
    class NHibernateDataService : IDataService, IDisposable
    {

        public ISession Session 
        {
            get { return _session; }         
        }

        public Boolean SessionIsOpen
        {
            get { return _sessionIsOpen; }
        }

        ISession _session;     
        Configuration _nHibernateConfiguration;
        ISessionFactory _nHibernateFactory;
       
        ITransaction _dbTransaction;

        private Boolean _sessionIsOpen = false;

        /// <summary>
        /// Constructor
        /// </summary>
        public NHibernateDataService()
        {
           
            _nHibernateConfiguration = new Configuration();
            _nHibernateConfiguration.AddAssembly("ORMNhibernateMaps");
            _nHibernateFactory = _nHibernateConfiguration.BuildSessionFactory();      
        }

        /// <summary>
        /// Begin Transaction
        /// </summary>
        public void BeginTransaction()
        {
            if (_sessionIsOpen == false) OpenSession();

            _dbTransaction = _session.BeginTransaction();

            _sessionIsOpen = true;

        }

        /// <summary>
        /// Insert Entity
        /// </summary>
        /// <param name="entity"></param>
        public void Insert(Object entity)
        {
            _session.Save(entity);
        }

        /// <summary>
        /// Update Entity
        /// </summary>
        /// <param name="entity"></param>
        public void Update(Object entity)
        {
            _session.Update(entity);
        }    

        /// <summary>
        /// Commit Transaction
        /// </summary>
        /// <param name="closeSession"></param>
        public void CommitTransaction(Boolean closeSession)
        {
            _dbTransaction.Commit();

            if (closeSession == true)
                CloseSession();
        }

        /// <summary>
        /// Open Session
        /// </summary>
        public void OpenSession()
        {
            if (_sessionIsOpen == false)
            {
                _session = _nHibernateFactory.OpenSession();
                _sessionIsOpen = true;
            }

        }

        /// <summary>
        /// Close Session
        /// </summary>
        public void CloseSession()
        {
            _session.Close();
            _sessionIsOpen = false;
            _session.Dispose();
        }

        /// <summary>
        /// Dispose 
        /// </summary>
        public void Dispose()
        {
            if (_sessionIsOpen == true)
                CloseSession();

            if (_dbTransaction != null)
                _dbTransaction.Dispose();

        }

    }
}